In a nutshell, “Hannibal” is a raw, intellectual procedural following
Will and Hannibal as they track a different serial killer each week.
Through the course of their investigations, you slowly find out more
about Hannibal through Will's findings and theories about the killer
they seek. Then Hannibal, as Will’s oddly engaging therapist, discusses
the emotional effects of the case while dealing with the usually violent
conclusion at the end of each episode.

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Hannibal just sees the world in a different way than us. So do these
other serial killers but not as clearly as he does. There is no line for
him, which is why he sees beauty in killing. He is pure in this way,
and Hannibal must stay mysterious for the show to work long-term.

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Obviously, having these interesting characters on television means
you can think about their motivations and discuss them even more than
before, if you so desire. Usually shows like “House” or “Sherlock” are
compelling mostly because the lead character is always the smartest man
in the room. “Hannibal” gives you two such characters, and the
compelling thing is guessing which one of them is smarter.